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Finding the Fourth Proportional to 983.37, 1,356.35 and 646.86

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Solution

The fourth proportional to 983.37, 1,356.35 and 646.86 is: 892.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.37 : 1,356.35 = 646.86 : x
  2. Step 2: Convert to fraction form
    983.37/1,356.35 = 646.86/x
  3. Step 3: Cross multiply
    983.37x = 1,356.35 × 646.86
  4. Step 4: Simplify right side
    983.37x = 877,366.60
  5. Step 5: Solve for x
    x = 877,366.60/983.37
  6. Step 6: Final answer
    x = 892.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.